The case parts printed well.  There were a couple of places where the print pulled up a tiny little bit in the corners, despite a 10 brim, but not very noticeably.  I joined the pieces to together with M4 x 12 mm bolts and nuts.

Then I fitted "skin" onto the frame. With the skin on I was able to adjust the keyboard to fit inside of the cutout and screw it down. To Steve's credit (the measurer) and Dave's (the keyboard maker) it fit perfectly.  All I had to do then is 3D print a logo and voila!

Even though not necessary, for authenticity I thought about adding the 14 or so screws that can be seen on the top of the original's case, but in the end decided that I liked the cleaner look of what I have. 

So this marks a milestone in my project. With the case complete I was able to change the primary photo for this project post to be my reproduction's, replacing the original's photo that I was using as a place holder.